Removable chill ring



March 14, 1933. D. G. DAwKlNs l REMOVABLE CHILL RING Filed May 17, 1932 DON G. DAWKINS f /NVENTOR 'ylul J A ro/iwfry `5,0 pipe -as t Patented Man 14, 1933 PA'I'ENT; OFFICE DON G. DAWKINB, l' PABX, CALIFORNIA.

amrovnm CHILL BIDG Application illed lay 17, 1938. Seriallo. 611,868.

The object of my invention is to provide a removable chill ring or back-up for use in welding joints of pipes Itogether, as in the construction of pipe lines.

In welding longitudinal seams, as in making pipe or drums from rolled sheets, it is common practice to use back-up strips or chilll plates. In welding iron and steel, these back-up or chill plates are usuall made of copper because o its relatively hig thermal conductivity and melting point.

The results of the use of a chi-ll plate are well known. Where such a plate is used, it is i ,possible to obtain proper fusion to the bottom of the beveled edges and flush joints on the inside of the pipe. Where i-t is not used, the weld will, in almost all cases, show constantly recurring internal 4projections oi metal (icicles) due to over-fusion alternating with spots where fusion is not carried to the bottom of the groove, the Weld thus having less than full strength. The obvious purpose of the chill plate is to enable the g5 operator to fuse a suicient amountof metal to completely fill the groove without danger of any of this metal flowing through the bottom. i

, To facilitate the welding of circumferential joints in pipe line construction it iscustomary to use a thin gauge pressed steel ring which serves the same nrpose as the chill plate mentioned above. his steel ring, however, is not removable and is a serious disadvantage inasmuch as it reduces the diameter of the pipe. Toobviate this disadvantage several manufacturers bell the ends of their pipe to receive this thin steel ring or liner', thus avoiding reduction of diameter,

- 4o but only at a serious addition to manufacturin cost.

y invention provides a removable chill.

ring which can be used in pipe having the same diameter throughout its length and .4 which enables the-'welder to revolve the pipe during the welding operation so as to workA onlyl on the upper portion of the circumferential groove, the chillring automatically taking a osition in the uppe portion ofthe Belatter is revolved.

My invention also provides a contractible chill ring which may be placed in the pipe in contracted form and therein expanded to the full inner diameter of thev p'pe a backing for the entire joint.

The object and advantages of my invention may be seen by reference to the attached drawing, in which:

Fig. 1 representsin longitudinal section a oo complete assemblyhwith a solid ring in place in the pipe. i

Fig. 2 is a cross section on the line 22 of Fig. 1;

Fig. 3 is a" cross section on the line 3-3 05 of Flg. 1, on an enlarged scale;

Fig. 4 illustrates lin cross section the contractibleform of chill ring, and

Fig. 5 illustrates in longitudinal section a means for contracting and expanding this 7 ring. l Referring to the figures, 10 and 11 are joints of pipe having their adjacent edges beveled in order to form a circumferential joint as at 12. 13 is a continuous rin of copper having an outside diameter slig tly less than the inside diameter of the pipe to beI Welded. 14 is a relatively stiff rod or pipe, an end of which is swiveled inside the chill ring as by the ball 15 seated in any convenient spider or frame 16 to which the chill ring 13 is attached.

Referring to Figs. 1 and 3, 17 is a metal block shaped to approximately t the inner curvature of the pipe and carried on rollers 18. The supportin rod 14 is carried in the. upper portion of t is block, as by a roller bearing 19.

The end of rod 14 which projects from the w pipe is provided with a weight 20 which may be setv in position on the rod y means of a set screw 21. The use of thi weight is op tional as, if the bearing block 17 is set close enough to the chill ring 13, the weight of the 95 outer end of the rod will suce to hold. the upper part of the chill ring in contact with the u r inner surface of the pipe.

In 1g. 2, 22 is the conventional dolly block provided with rollers 23 on which the pipe 100 so as to afford l may be revolved while the joint is being welded.

My device fis used in the following manner z The chill ring 13 with its supporting rod 14 is inserted in the pipe and moved inwardly until the chill ring is more or less centered on the seam to be welded; in this operation the outer end of the rod is sufficiently lifted f to enable the block 17 to maintain a position more or less adjacent to the chill ring, as illustrated in Fig. 1. The outer end of the rod is then lowered and, if necessary the weight 20 is attached. The weight of the free end of the rod, together with that of the attached weight 20, if used, then lifts the chill ring into contact with the upper inner surface of the pipe, the block 17 acting as a fulcrum.

Such portion of the joint as is now in contact with-the chill ring is welded and the pipe then revolved through a relatively small arc to bring to the upper side an unwelded portion of the=joint. The free end of the rod `1s then lifted, allowing the block 17, the

Weight of which is unbalanced as shown to swing to its lowermost position. The ee end of the rod beingl then lowered, the chill ring is again broug t into contact with the inner surface of the pipe on the upper side, permittin the uppermost portion of the oint curnfefential pipe joints, comprising: a ring cf heat-conducting metal having an outside diameter slightly less than the inside diameter of the pipe to be welded; a rod having one end attached to and swiveled within said ring; a fulcrum adapted, to t within said pipe and to support said rod at an intermedi# ate point, and sucient weight in connection with said rod beyond said fulcrum to hold said ring in contact with the upper inner portion of said pipe.

2. A removable chill ring for welding circumferential pipe joints, comprising: a ring of heat-conductmg -metal having an outside .diameter slightly less than the inside diame- In witness that I claim t e foregoing I l day of May, 1932.

y DON G. DAW'KINS.

have hereunto subscribed my name this 10 to be wel ed, and this operation is repeated until the pipe has been revolved through a full circle .and the circumferential weld is completed. At this time the weight 20, if used, is' removed, the outer end of the rod lifted to free the rollers 18 from contact with the pipe, and the entire apparatus withdrawn from the open end. All these operations may be performed by hand with great rapidity `40 so that 'no delay to the welding operation is caused.

Referring to Figs. 4 and 5, 24 is a resilient" band of metal, as, for instance, hard copper, havin a hole 25 in one end and a slot 26 in 45 the ot er. A yoke 27 having a T handle 28 enters these openings as indicated in Fig. 5.

By turning the T handle lefthandedly .the

ring may be contracted suiciently to enable it to be moved as desired inside the pipe,

while Dturning the T righthandedly causes zthe ends of the toabut as indicated b dotted line 29, witthefring in contact wi the pipejhroughot itslength. It will-'be ev1dentthgatjn1y invention is susceptible to numerous'fmodiicationsof structure without departn from its spirit and it is my-jintention to naim the invention as broadly as the state of the art permits. In the attached claims, where I make u se of the term rod, referring to the part 14 m the attached drawing, it will be understood that this rod may be solid or it may be hollow to form a pipe or tube. Y

I claim as my invention:

1. A removable chill ring for welding cir- 

